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The Canadian actress had on a shimmering blazer with wide black lapels that was adorned with hundreds of tiny mirrors of various shapes.

She wore a busty low-cut dress below it that was covered in the same mirrors and put her slender legs on display.

Shay gripped a metallic clutch that perfectly matched her outfit and elevated her stature with a pair of clear stilettos.

Celebrity twins: With her new platinum wig and mirror outfit, Shay looked surprisingly like fellow attendee Taylor Swift. The 29-year-old singer had a similarly shaped dress with large sequins that had a similar effect to Shay's patchwork mirrors

With her new blonde wig and gleaming outfit, Shay looked surprisingly like fellow attendee Taylor Swift.

The 29-year-old singer had a similarly shaped — though higher cut — dress. It's large sequins had a similar effect to Shay's patchwork mirrors.

Her cat-eye makeup also was a dead ringer for Ariana Grande's now-standard look.

Channelling another star: The Pretty Little Liars star's cat-eye makeup also was a dead ringer for Ariana Grande's now-standard look

Smoky eyes: Shay looked like Ariana thanks to her cat-eye makeup; pictured in December

New look: The Ontario-born actress had a dry run for her new blonde look on Monday, when a team of hair and makeup artists did her up in another blonde wig and a leopard print dress

The Ontario-born actress had a dry run for her new blonde look on Monday, when a team of hair and makeup artists did her up in another blonde wig and a leopard print dress.

The You actress had a laugh about her extreme makeover when she posted photos to Instagram documenting a wardrobe malfunction as one of her dress straps popped off, almost exposing her.

Incredible: Following the awards bash, Shay was also seen out and about in Los Angeles

Jaw-dropping: Shay's statement silver look was difficult to miss as she exited the star-studded awards bash

Sizzling: Due to her perspex clear heels, Shay almost seemed to be walking barefoot as she headed into the city

A vision: The former teen drama star showcased her amazing physique with her blonde tresses in dramatic waves

Transformed: Shay is usually immaculately turned out and is best known for being a stunning brunette, but changed up her look with a blonde wig and icy contact lenses for the photoshoot

Whoops! The You actress had a laugh about her extreme makeover when she posted photos to Instagram documenting a wardrobe malfunction as one of her dress straps popped off, almost exposing her

Seeing the actress have some fun was a nice departure for fans after her difficult 2018.

In January, Shay revealed in a text post to her Instagram Stories that she'd suffered a miscarriage the previous year.

She included a tiny sonogram picture of what would have been her first child.

'We all have to deal with various struggles and challenges in life,' wrote Shay. 'And sometimes it's easier to only showcase the good times on social media, which is what leads many people to criticize it for its lack of authenticity.'

'Having so many people follow me on Instagram and read my posts is both incredibly humbling and hugely uplifting,' she continued. 'The support and affection that so many of you show me lifts me up during even my darkest days, one of which happened last year after I miscarried and lost the child of my hopes and dreams.

Shay has been dating Candian music reporter Matte Babel since early 2017.

On the upswing: Seeing the actress have some fun was a nice departure for fans after her difficult 2018. In January, Shay revealed in a text post to her Instagram Stories that she'd suffered a miscarriage the previous year

iHeartRadio Awards 2019 Winners

Tour of the Year

WINNER: Taylor Swift, Reputation Stadium Tour

Adding to her collection: Taylor Swift won Tour Of The Year before the event

Artist of the Decade

WINNER: Garth Brooks

iHeartRadio Innovator Award

WINNER: Alicia Keys

Fangirls Award

WINNER: Halsey

Most Thumbed-Up Artist of the Year

WINNER: Imagine Dragons

Song of the Year

"Better Now," Post Malone

"Girls Like You," Maroon 5 featuring Cardi B

"God's Plan," Drake

"Perfect," Ed Sheeran

WINNER: "The Middle," Zedd, Maren Morris, Grey

Female Artist of the Year

WINNER: Ariana Grande

Camila Cabello

Cardi B

Dua Lipa

Halsey

Thank U, Next: Ariana Grandeis a favorite for Female Artist Of The Year

Male Artist of the Year

Winner: Drake

Ed Sheeran

Kendrick Lamar

Post Malone

Shawn Mendes

Best Duo/Group of the Year

WINNER: 5 Seconds of Summer

Imagine Dragons

Maroon 5

Panic! At The disco

twenty one pilots

Best Collaboration

WINNER: "Finesse (Remix)," Bruno Mars featuring Cardi B

"Girls Like You," Maroon 5 featuring Cardi B

"I Like It," Cardi B featuring Bad Bunny and J Balvin

"Meant to Be," Bebe Rexha Featuring Florida Georgia Line

"The Middle," Zedd, Maren Morris, Grey

Best New Pop Artist

Bazzi

Lauv

WINNER: Marshmello

MAX

NF

Alternative Rock Song of the Year

"Africa," Weezer

"Broken," lovelytheband

"Happier," Marshemllo featuring Bastille

WINNER: "High Hopes," Panic! At The Disco

"Natural," Imagine Dragons

Say It Ain't So: Weezer is nominated for Alternative Rock Song of the Year

Alternative Rock Artist of the Year

Imagine Dragons

WINNER: lovelytheband

Panic! At The Disco

Portugal. The Man

Thirty Seconds to Mars

Best New Rock/Alternative Rock Artist

AJR

Badflower

WINNER: Billie Eilish

lovelytheband

Two Feet

Rock Song of the Year

"Are You Ready," Disturbed

"Bulletproof," Godsmack

"Devil," Shinedown

WINNER: "Safari Song," Greta Van Fleet

"Zombie," Bad Wolves

Rock Artist of the Year

Five Finger Death Punch

Godsmack

Greta Van Fleet

Shinedown

WINNER: Three Days Grace

Country Song of the Year

"Heaven," Kane Brown

WINNER: "Meant to Be," Bebe Rexha featuring Florida Georgia Line

"Most People Are Good," Luke Bryan

"Rich," Maren Morris

"Tequila," Dan + Shay

Country Artist of the Year

Carrie Underwood

Jason Aldean

Luke Bryan

WINNER: Luke Combs

Thomas Rhett

Gold standard: Carrie Underwood is nominated for Country Artist of the Year

Best New Country Artist

Carly Pearce

Dylon Scott

WINNER: Jordan Davis

LANCO

Russell Dickerson

Dance Song of the Year

"Friends," Marshmello and Anne-Marie

"Happier," Marshmello featuring Bastille

"One Kiss," Calvin Harris and Dua Lipa

"Remind Me to Forget," Kygo featuring Miguel

WINNER: "The Middle," Zedd, Maren Morris, Grey

Dance Artist of the Year

Calvin Harris

Kygo

WINNER: Marshmello

The Chainsmokers

Zedd

Hip-Hop Song of the Year

WINNER: "God's Plan," Drake

"I Like It, Cardi B featuring Bad Bunny and J Balvin

"In My Feelings," Drake

"Nice for What," Drake

"Psycho," Post Malone featuring Ty Dolla $ign

Hip-Hop Artist of the Year

WINNER: Cardi B

Drake

Kendrick Lamar

Post Malone

Travis Scott

Money: Cardi B will be vying for the coveted Hip-Hop Artist of the Year

Best New Hip-Hop Artist

WINNER: BlocBoy JB

Juice WRLD

Lil Baby

Lil Pump

XXXTENTACION

R&B Song of the Year

WINNER: "Boo'd Up," Ella Mai

"Finesse (Remix)," Bruno Mars featuring Cardi B

"Medicine," Queen Naija

"Sky Walker," Miguel featuring Travis Scott

"When We," Tank

R&B Artist of the Year

Daniel Caesar

WINNER: Ella Mai

H.E.R.

Miguel

SZA

Love Galore: Sza face heavy competition for R&B Artist of the Year

Best New R&B Artist

Brent Faiyaz

WINNER: Ella Mai

H.E.R.

Queen Naija

TK Kravitz

Latin Song of the Year

"Clandestino," Shakira featuring Maluma

"Dura," Daddy Yankee

"Echame La Culpa," Luis Fonsi and Demi Lovato

"Me Niego," Reik featuring Ozuna and Wisin

WINNER: "X," Nicky Jam and J Balvin

Latin Artist of the Year

WINNER: Bad Bunny

Daddy Yankee

J Balvin

Maluma

Ozuna

Best New Latin Artist

Lele Pons

WINNER: Manuel Turizo

Mau y Ricky

Nio Garcia

Raymix

Regional Mexican Song of the Year

"Entre Beso y Beso," La Arrolladora Banda El Limón

"Me Dejé Llevar," Christian Nodal

"Mejor Me Alejo," Banda MS

"Mi Sorpresa Fuiste Tú," Calibre 50

WINNER: "Mitad Y Mitad," Calibre 50

Regional Mexican Artist of the Year

Banda Carnaval

Banda sinaloense MS de Sergio Lizárraga

WINNER: Calibre 50

Christian Nodal

Gerardo Ortiz

Producer of the Year

David Garcia

Franke Dukes

Louis Bell

WINNER: Marshmello

Noah "40" Shebib

Best Lyrics (Socially Voted Category)

WINNER: "Consequences," Camila Cabello

"Girls Like You," Maroon 5 featuring Cardi B

"God's Plan," Drake

"In My Blood," Shawn Mendes

"thank u, next," Ariana Grande

"Without Me," Halsey

Sending a message: Halsey is up for social media voted category Best Lyrics